| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
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| ** This file is part of the examples of the Qt Toolkit. |
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| |
| #include "httpwindow.h" |
| |
| #include "ui_authenticationdialog.h" |
| |
| #include <QtWidgets> |
| #include <QtNetwork> |
| #include <QUrl> |
| |
| #if QT_CONFIG(ssl) |
| const char defaultUrl[] = "https://www.qt.io/"; |
| #else |
| const char defaultUrl[] = "http://www.qt.io/"; |
| #endif |
| const char defaultFileName[] = "index.html"; |
| |
| ProgressDialog::ProgressDialog(const QUrl &url, QWidget *parent) |
| : QProgressDialog(parent) |
| { |
| setWindowTitle(tr("Download Progress")); |
| setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint); |
| setLabelText(tr("Downloading %1.").arg(url.toDisplayString())); |
| setMinimum(0); |
| setValue(0); |
| setMinimumDuration(0); |
| setMinimumSize(QSize(400, 75)); |
| } |
| |
| ProgressDialog::~ProgressDialog() |
| { |
| } |
| |
| void ProgressDialog::networkReplyProgress(qint64 bytesRead, qint64 totalBytes) |
| { |
| setMaximum(totalBytes); |
| setValue(bytesRead); |
| } |
| |
| HttpWindow::HttpWindow(QWidget *parent) |
| : QDialog(parent) |
| , statusLabel(new QLabel(tr("Please enter the URL of a file you want to download.\n\n"), this)) |
| , urlLineEdit(new QLineEdit(defaultUrl)) |
| , downloadButton(new QPushButton(tr("Download"))) |
| , launchCheckBox(new QCheckBox("Launch file")) |
| , defaultFileLineEdit(new QLineEdit(defaultFileName)) |
| , downloadDirectoryLineEdit(new QLineEdit) |
| , reply(nullptr) |
| , file(nullptr) |
| , httpRequestAborted(false) |
| { |
| setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint); |
| setWindowTitle(tr("HTTP")); |
| |
| connect(&qnam, &QNetworkAccessManager::authenticationRequired, |
| this, &HttpWindow::slotAuthenticationRequired); |
| #ifndef QT_NO_SSL |
| connect(&qnam, &QNetworkAccessManager::sslErrors, |
| this, &HttpWindow::sslErrors); |
| #endif |
| |
| QFormLayout *formLayout = new QFormLayout; |
| urlLineEdit->setClearButtonEnabled(true); |
| connect(urlLineEdit, &QLineEdit::textChanged, |
| this, &HttpWindow::enableDownloadButton); |
| formLayout->addRow(tr("&URL:"), urlLineEdit); |
| QString downloadDirectory = QStandardPaths::writableLocation(QStandardPaths::TempLocation); |
| if (downloadDirectory.isEmpty() || !QFileInfo(downloadDirectory).isDir()) |
| downloadDirectory = QDir::currentPath(); |
| downloadDirectoryLineEdit->setText(QDir::toNativeSeparators(downloadDirectory)); |
| formLayout->addRow(tr("&Download directory:"), downloadDirectoryLineEdit); |
| formLayout->addRow(tr("Default &file:"), defaultFileLineEdit); |
| launchCheckBox->setChecked(true); |
| formLayout->addRow(launchCheckBox); |
| |
| QVBoxLayout *mainLayout = new QVBoxLayout(this); |
| mainLayout->addLayout(formLayout); |
| |
| mainLayout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding)); |
| |
| statusLabel->setWordWrap(true); |
| mainLayout->addWidget(statusLabel); |
| |
| downloadButton->setDefault(true); |
| connect(downloadButton, &QAbstractButton::clicked, this, &HttpWindow::downloadFile); |
| QPushButton *quitButton = new QPushButton(tr("Quit")); |
| quitButton->setAutoDefault(false); |
| connect(quitButton, &QAbstractButton::clicked, this, &QWidget::close); |
| QDialogButtonBox *buttonBox = new QDialogButtonBox; |
| buttonBox->addButton(downloadButton, QDialogButtonBox::ActionRole); |
| buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole); |
| mainLayout->addWidget(buttonBox); |
| |
| urlLineEdit->setFocus(); |
| } |
| |
| HttpWindow::~HttpWindow() |
| { |
| } |
| |
| void HttpWindow::startRequest(const QUrl &requestedUrl) |
| { |
| url = requestedUrl; |
| httpRequestAborted = false; |
| |
| reply = qnam.get(QNetworkRequest(url)); |
| connect(reply, &QNetworkReply::finished, this, &HttpWindow::httpFinished); |
| connect(reply, &QIODevice::readyRead, this, &HttpWindow::httpReadyRead); |
| |
| ProgressDialog *progressDialog = new ProgressDialog(url, this); |
| progressDialog->setAttribute(Qt::WA_DeleteOnClose); |
| connect(progressDialog, &QProgressDialog::canceled, this, &HttpWindow::cancelDownload); |
| connect(reply, &QNetworkReply::downloadProgress, progressDialog, &ProgressDialog::networkReplyProgress); |
| connect(reply, &QNetworkReply::finished, progressDialog, &ProgressDialog::hide); |
| progressDialog->show(); |
| |
| statusLabel->setText(tr("Downloading %1...").arg(url.toString())); |
| } |
| |
| void HttpWindow::downloadFile() |
| { |
| const QString urlSpec = urlLineEdit->text().trimmed(); |
| if (urlSpec.isEmpty()) |
| return; |
| |
| const QUrl newUrl = QUrl::fromUserInput(urlSpec); |
| if (!newUrl.isValid()) { |
| QMessageBox::information(this, tr("Error"), |
| tr("Invalid URL: %1: %2").arg(urlSpec, newUrl.errorString())); |
| return; |
| } |
| |
| QString fileName = newUrl.fileName(); |
| if (fileName.isEmpty()) |
| fileName = defaultFileLineEdit->text().trimmed(); |
| if (fileName.isEmpty()) |
| fileName = defaultFileName; |
| QString downloadDirectory = QDir::cleanPath(downloadDirectoryLineEdit->text().trimmed()); |
| bool useDirectory = !downloadDirectory.isEmpty() && QFileInfo(downloadDirectory).isDir(); |
| if (useDirectory) |
| fileName.prepend(downloadDirectory + '/'); |
| if (QFile::exists(fileName)) { |
| if (QMessageBox::question(this, tr("Overwrite Existing File"), |
| tr("There already exists a file called %1%2." |
| " Overwrite?") |
| .arg(fileName, |
| useDirectory |
| ? QString() |
| : QStringLiteral(" in the current directory")), |
| QMessageBox::Yes | QMessageBox::No, |
| QMessageBox::No) |
| == QMessageBox::No) { |
| return; |
| } |
| QFile::remove(fileName); |
| } |
| |
| file = openFileForWrite(fileName); |
| if (!file) |
| return; |
| |
| downloadButton->setEnabled(false); |
| |
| // schedule the request |
| startRequest(newUrl); |
| } |
| |
| std::unique_ptr<QFile> HttpWindow::openFileForWrite(const QString &fileName) |
| { |
| std::unique_ptr<QFile> file(new QFile(fileName)); |
| if (!file->open(QIODevice::WriteOnly)) { |
| QMessageBox::information(this, tr("Error"), |
| tr("Unable to save the file %1: %2.") |
| .arg(QDir::toNativeSeparators(fileName), |
| file->errorString())); |
| return nullptr; |
| } |
| return file; |
| } |
| |
| void HttpWindow::cancelDownload() |
| { |
| statusLabel->setText(tr("Download canceled.")); |
| httpRequestAborted = true; |
| reply->abort(); |
| downloadButton->setEnabled(true); |
| } |
| |
| void HttpWindow::httpFinished() |
| { |
| QFileInfo fi; |
| if (file) { |
| fi.setFile(file->fileName()); |
| file->close(); |
| file.reset(); |
| } |
| |
| if (httpRequestAborted) { |
| reply->deleteLater(); |
| reply = nullptr; |
| return; |
| } |
| |
| if (reply->error()) { |
| QFile::remove(fi.absoluteFilePath()); |
| statusLabel->setText(tr("Download failed:\n%1.").arg(reply->errorString())); |
| downloadButton->setEnabled(true); |
| reply->deleteLater(); |
| reply = nullptr; |
| return; |
| } |
| |
| const QVariant redirectionTarget = reply->attribute(QNetworkRequest::RedirectionTargetAttribute); |
| |
| reply->deleteLater(); |
| reply = nullptr; |
| |
| if (!redirectionTarget.isNull()) { |
| const QUrl redirectedUrl = url.resolved(redirectionTarget.toUrl()); |
| if (QMessageBox::question(this, tr("Redirect"), |
| tr("Redirect to %1 ?").arg(redirectedUrl.toString()), |
| QMessageBox::Yes | QMessageBox::No) == QMessageBox::No) { |
| QFile::remove(fi.absoluteFilePath()); |
| downloadButton->setEnabled(true); |
| statusLabel->setText(tr("Download failed:\nRedirect rejected.")); |
| return; |
| } |
| file = openFileForWrite(fi.absoluteFilePath()); |
| if (!file) { |
| downloadButton->setEnabled(true); |
| return; |
| } |
| startRequest(redirectedUrl); |
| return; |
| } |
| |
| statusLabel->setText(tr("Downloaded %1 bytes to %2\nin\n%3") |
| .arg(fi.size()).arg(fi.fileName(), QDir::toNativeSeparators(fi.absolutePath()))); |
| if (launchCheckBox->isChecked()) |
| QDesktopServices::openUrl(QUrl::fromLocalFile(fi.absoluteFilePath())); |
| downloadButton->setEnabled(true); |
| } |
| |
| void HttpWindow::httpReadyRead() |
| { |
| // this slot gets called every time the QNetworkReply has new data. |
| // We read all of its new data and write it into the file. |
| // That way we use less RAM than when reading it at the finished() |
| // signal of the QNetworkReply |
| if (file) |
| file->write(reply->readAll()); |
| } |
| |
| void HttpWindow::enableDownloadButton() |
| { |
| downloadButton->setEnabled(!urlLineEdit->text().isEmpty()); |
| } |
| |
| void HttpWindow::slotAuthenticationRequired(QNetworkReply *, QAuthenticator *authenticator) |
| { |
| QDialog authenticationDialog; |
| Ui::Dialog ui; |
| ui.setupUi(&authenticationDialog); |
| authenticationDialog.adjustSize(); |
| ui.siteDescription->setText(tr("%1 at %2").arg(authenticator->realm(), url.host())); |
| |
| // Did the URL have information? Fill the UI |
| // This is only relevant if the URL-supplied credentials were wrong |
| ui.userEdit->setText(url.userName()); |
| ui.passwordEdit->setText(url.password()); |
| |
| if (authenticationDialog.exec() == QDialog::Accepted) { |
| authenticator->setUser(ui.userEdit->text()); |
| authenticator->setPassword(ui.passwordEdit->text()); |
| } |
| } |
| |
| #ifndef QT_NO_SSL |
| void HttpWindow::sslErrors(QNetworkReply *, const QList<QSslError> &errors) |
| { |
| QString errorString; |
| for (const QSslError &error : errors) { |
| if (!errorString.isEmpty()) |
| errorString += '\n'; |
| errorString += error.errorString(); |
| } |
| |
| if (QMessageBox::warning(this, tr("SSL Errors"), |
| tr("One or more SSL errors has occurred:\n%1").arg(errorString), |
| QMessageBox::Ignore | QMessageBox::Abort) == QMessageBox::Ignore) { |
| reply->ignoreSslErrors(); |
| } |
| } |
| #endif |